NEC mPD789425, User Manual

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User’s Manual U15075EJ1V0UM00
3.1.2 Internal data memory (internal high-speed RAM) space .............................................................. 54
3.1.3 Special function register (SFR) area............................................................................................. 54
3.1.4 Data memory addressing.............................................................................................................. 55
3.2 Processor Registers.................................................................................................................. 61
3.2.1 Control registers ........................................................................................................................... 61
3.2.2 General-purpose registers ............................................................................................................ 64
3.2.3 Special function registers (SFRs) ................................................................................................. 65
3.3 Instruction Address Addressing.............................................................................................. 68
3.3.1 Relative addressing ...................................................................................................................... 68
3.3.2 Immediate addressing .................................................................................................................. 69
3.3.3 Table indirect addressing ............................................................................................................. 70
3.3.4 Register addressing...................................................................................................................... 70
3.4 Operand Address Addressing.................................................................................................. 71
3.4.1 Direct addressing.......................................................................................................................... 71
3.4.2 Short direct addressing................................................................................................................. 72
3.4.3 Special function register (SFR) addressing .................................................................................. 73
3.4.4 Register addressing...................................................................................................................... 74
3.4.5 Register indirect addressing ......................................................................................................... 75
3.4.6 Based addressing ......................................................................................................................... 76
3.4.7 Stack addressing .......................................................................................................................... 76
CHAPTER 4 PORT FUNCTIONS........................................................................................................... 77
4.1 Port Functions ........................................................................................................................... 77
4.2 Port Configuration..................................................................................................................... 80
4.2.1 Port 0 ............................................................................................................................................ 81
4.2.2 Port 1 ............................................................................................................................................ 82
4.2.3 Port 2 ............................................................................................................................................ 83
4.2.4 Port 3 ............................................................................................................................................ 89
4.2.5 Port 5 ............................................................................................................................................ 91
4.2.6 Port 6 ............................................................................................................................................ 92
4.2.7 Port 7 ............................................................................................................................................ 93
4.2.8 Port 8 (
µ
PD789426, 789436 Subseries only) ............................................................................... 94
4.2.9 Port 9 (
µ
PD789426, 789436 Subseries only) ............................................................................... 95
4.3 Registers Controlling Port Function........................................................................................ 96
4.4 Port Function Operation ......................................................................................................... 102
4.4.1 Writing to I/O port........................................................................................................................ 102
4.4.2 Reading from I/O port ................................................................................................................. 102
4.4.3 Arithmetic operation of I/O port................................................................................................... 102
CHAPTER 5 CLOCK GENERATOR.................................................................................................... 103
5.1 Clock Generator Functions .................................................................................................... 103
5.2 Clock Generator Configuration .............................................................................................. 103
5.3 Registers Controlling Clock Generator ................................................................................. 105
5.4 System Clock Oscillators ....................................................................................................... 108
5.4.1 Main system clock oscillator ....................................................................................................... 108